JP6527810B2 - Floor lift - Google Patents

Description

  The present invention relates to a floor lift for carrying in and out loading pallets and empty pallets for a vertical transfer machine that uses pallets to transfer loads.

  There is used a vertical transfer machine which moves up and down over a plurality of floors, and carries out an operation of loading articles on pallets and transporting them, and an operation of returning empty pallets to the original floors in parallel. ing. Each floor is provided with a floor lift for carrying in and out loading pallets and empty pallets for the vertical transfer machine.

The outline of the invention described in Patent Document 1 will be described with reference to FIG.
Each pallet 80 is provided with a pair of left and right flanges 85, 85.
The vertical transfer unit 90 includes a pair of left and right upper conveyors 91 and 91 for transferring the loading pallet 81 and a pair of left and right lower conveyors 92 and 92 for transferring the empty pallet 82.

  The floor lift 110 includes a pair of upper stage conveyors 120 and 120 for loading and unloading the loading pallets 81 and a pair of lower stage conveyors 130 and 130 for loading and unloading the empty pallets 82.

  Although the floor lift 110 needs a lifting mechanism for lifting and lowering the loading pallet 81 and the empty pallet 82, the upper conveyors 120 and 120 and the lower conveyors 130 and 130 move up and down, respectively. There is.

The upper conveyors 120, 120 must be able to descend over the flanges 85, 85 in order to catch the loading pallets 81 placed on the floor.
Also, the upper conveyors 120, 120 must be able to rise past the flanges 85, 85 after unloading the loading pallet 81 onto the floor.

Therefore, the pair of upper stage conveyors 120, 120 are provided with an expansion / contraction mechanism that enables the distance between the upper and lower conveyors 120, 120 to move up and down over the flanges 85, 85. It is possible to go up and down.
As the expansion and contraction means, a configuration in which the upper stage conveyor 120 rotates with respect to the fixed frame 111 is employed. The direction of rotation is orthogonal to the direction of travel.

However, the upper conveyors 120 and 120 require mechanical strength to transport the loading pallet 81 having a weight of 1 to 2 tons, and use relatively large members.
For this reason, the fixed frame 111 is formed into a large box shape, and the elevating mechanism and the expanding and contracting mechanism are housed inside thereof, which makes the floor lift 110 larger and more complicated.

  Although the floor lift 210 which raises / lowers the pallet 80 by the support nail | claw 241,241 is described in patent document 2 as shown in FIG. 12, it has the same problem.

JP, 2008-50088, A Japanese Patent Application Publication No. 2003-40440

  Therefore, the present invention is a floor lift for carrying in and out loading pallets and empty pallets to a vertical transfer machine for transferring loads using pallets, and provides a simplified and miniaturized floor lift The purpose is to This aims to provide an economical floor lift.

  In order to achieve the above object, according to the floor lift of the present invention, the above-mentioned loading is carried out with respect to the vertical transfer machine which transports a loading pallet loaded on a pallet having a pair of left and right flanges and returns empty pallets. A floor lift comprising a pair of left and right upper stage conveyors for carrying in and out pallets, and a pair of left and right lower stage conveyors for carrying in and out the empty pallets, wherein the distance between the pair of upper stage conveyors can be expanded and contracted. In each of the left and right sides, the upper stage conveyor is connected to the upper stage frame portion of the fixed frame by a plurality of pivoting members, and the respective pivoting members are pivotable with respect to the upper stage frame portion The upper stage conveyor can be rotated with respect to the upper stage conveyor, and the upper stage conveyor can be moved closer to or separated from the upper stage frame portion by the rotation of each rotation member. It is.

The rotating member includes a fixed side shaft forming a hinge on the upper frame portion side and a moving side shaft forming a hinge on the upper conveyor side, and the fixed side shaft and the moving side shaft However, it can be set as the structure connected in parallel by the rotation board.
Further, the movable side shaft portion may be shorter than the fixed side shaft portion, and may be positioned on the lower side of the fixed side shaft portion.

In each of the left and right sides, one of the rotating members has an action point for receiving the driving force, and a straight line connecting the action point and the center of the fixed side shaft portion, the center of the moving side shaft portion, and An angle formed by a straight line connecting the center of the fixed side shaft portion may be 30 ° or more.
In addition, on each of the left and right sides, the angular range in which the rotating members rotate can be configured to be 60 ° or more.

The lower conveyor may be attached to the lower frame portion of the fixed frame on each of the left and right sides, and the upper frame portion and the lower frame portion can be moved up and down.
Further, the upper frame portion and the lower frame portion may be connected to be able to approach and be separated from each other on the left and right sides, respectively.

In the floor lift according to the present invention, the upper stage conveyor and the upper stage frame are connected by a plurality of rotating members, and the upper stage conveyor can be moved closer to or separated from the upper stage frame by rotating each rotating member. it can.
By this, it is possible to make the expansion and contraction mechanism small and to simplify, and it becomes possible to attach the upper stage conveyor and the upper stage frame portion to the small columnar fixed frame. In addition, the lifting mechanism can be simplified and miniaturized.
Therefore, the entire floor lift can be made compact.

It is a schematic diagram which shows the conveyance system by a vertical conveyance machine and a floor lift. It is a schematic plan view which shows the floor lift of embodiment of this invention. It is a schematic elevation view in the AA arrow of FIG. It is a schematic side view in the BB arrow of FIG. It is the schematic perspective view which looked at the one side of the floor lift of embodiment of this invention from the conveyor side, Comprising: The case where the upper stage conveyor becomes a shrinking | reduction position is shown. It is a schematic perspective view similar to FIG. 5A, and shows the case where the upper stage conveyor is in the expanded position. It is the schematic perspective view which looked at the one side of the floor lift of embodiment of this invention from the back side, Comprising: The case where the upper stage conveyor is located in the lowest is shown. It is a schematic perspective view similar to FIG. 6A, and shows the case where the upper stage conveyor is lifted with the lower stage conveyor. It is a schematic plan view which shows the one side of FIG. 1 on an enlarged scale, and shows the state which the upper stage conveyor separated from the upper stage frame part. It is a schematic plan view which shows the one side of FIG. 1 in enlargement, and shows the state which the upper stage conveyor is approaching to the upper stage frame part. It is the schematic of the rotation member shown by the 3rd view by the third trigonometry. It is the schematic plan view and schematic side view of the rotation member in the contracted position shown by third trigonometry. It is the schematic plan view and schematic side view of the rotation member in the expansion position shown by the third triangle method. It is a schematic perspective view which shows the conventional floor lift. It is a schematic front view which shows the other conventional floor lift.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 schematically shows a transfer system constituted by a vertical transfer machine 90 and a plurality of floor lifts 10.

The pallet 80 used for conveyance is provided with a pair of left and right flanges 85, 85 as described in FIG.
In the present specification, the pallets 80 are often referred to as loading pallets 81 and empty pallets 82 in distinction.

The vertical transfer unit 90 includes a pair of left and right upper conveyors 91 and 91 for transferring the loading pallet 81 and a pair of left and right lower conveyors 92 and 92 for transferring the empty pallet 82.
The transport unit 93 moves up and down over a plurality of floors, and the floor lifts 10 are installed on each floor.

Each floor lift 10 has a pair of upper stage conveyors 20, 20 for carrying in and out the loading pallet 81 to and from the vertical transfer machine 90, and a pair of lower stage conveyors 30 for carrying in and out the empty pallet 82, It has thirty.
In FIG. 1, it is assumed that the lower floor F1 is the package delivery side and the upper floor F2 is the package receiving side, and the operations performed by the respective floor lifts 10 will be described.

In the floor F1 on the sending side, the floor lift 10 is waiting for the loading pallets 81 to be placed on the upper stage conveyors 20, 20.
The transport section 93 of the vertical transport machine 90 places the empty pallets 82 on the lower conveyors 92, 92 and returns from the floor F2.

  When the transport unit 93 stops, the upper conveyors 91, 91 and the lower conveyors 92, 92 each stop at a predetermined height from the floor surface. At the same height, the upper conveyors 20, 20 and the lower conveyors 30, 30 stand by.

After the transport unit 93 stops, the upper conveyors 20, 20 and the upper conveyors 91, 91 can be advanced in the same direction, and the loading pallet 81 can be carried into the vertical conveyor 90.
At the same time, the lower conveyors 30, 30 and the lower conveyors 92, 92 can be advanced in the same direction to unload the empty pallets 82 from the vertical conveyor 90.

When the loading of the loading pallet 81 and the unloading of the empty pallet 82 are completed, the transport unit 93 rises toward the floor F2.
On the floor F1 from which the empty pallets 82 are carried out, the empty pallets 82 are once placed on the floor surface, and the load is put on this to make a loading pallet 81, which is put on the upper conveyors 20, 20 and raised to a predetermined position. To wait.

The transport unit 93 of the vertical transport device 90 places the loading pallets 81 on the upper conveyors 91, 91 and transports the load from the floor F1 to the floor F2.
In the floor F2 on the receiving side, the floor lift 10 places an empty pallet 82 on the lower conveyors 30, 30, and waits for the arrival of the transport unit 93 on which the loading pallet 81 is placed.

  When the transport unit 93 stops, the upper conveyors 91, 91 and the lower conveyors 92, 92 each stop at a predetermined height from the floor surface. At the same height, the upper conveyors 20, 20 and the lower conveyors 30, 30 stand by.

After the conveyance section 93 stops, the upper conveyors 20, 20 and the upper conveyors 91, 91 can advance in the same direction, and can unload the loading pallet 81 from the vertical conveyance device 90.
At the same time, the lower conveyors 30, 30 and the lower conveyors 92, 92 can be advanced in the same direction to carry the empty pallet 82 into the vertical conveyor 90.

When the unloading of the loading pallet 81 and the loading of the empty pallet 82 are completed, the transport unit 93 descends toward the floor F1.
On the floor F2 from which the loading pallets 81 are carried out, the loading pallets 81 are temporarily placed on the floor, and the load is taken down to form empty pallets 82, which are placed on the lower conveyors 92, 92 and raised to a predetermined position. To wait.
The above is the outline of the system shown in FIG.

  The outline of the floor lift 10 will be described with reference to FIGS. 2 is a schematic plan view of the floor lift 10, FIG. 3 is a schematic elevation view in the AA arrow of FIG. 2, and FIG. 4 is a schematic side view in the BB arrow of FIG.

  2 to 4 show the loading pallets 81 loaded on the upper conveyors 20, 20. FIG. The upper stage conveyors 20, 20 to be scaled are in the contracted position and capture the flanges 85, 85 of the pallet 80.

The upper conveyor 20 is attached to the upper frame portion 21 of the fixed frame 11 on each of the left and right sides. And as shown in FIG. 2, the upper stage conveyor 20 and the upper stage frame part 21 are connected by two rotation members 50 and 50. As shown in FIG.
Further, as shown in FIG. 3, the lower conveyor 30 is attached to the lower frame portion 31 of the fixed frame 11.

  The upper conveyor 20 is driven by the motor 25 and can carry in and out the loading pallet 81. The lower conveyor 30 is driven by the motor 35 and can carry in and out the empty pallet 82.

In the floor lift 10, the upper conveyor 20 and the lower conveyor 30 raise and lower the fixed frame 11 by means of the motor 26, and this forms an elevating mechanism for raising and lowering the pallet 80.
In addition, when the rotating member 50 is driven by the electric motor 60 to rotate, the upper conveyor 20 approaches and separates from the upper frame portion 21, which forms the expansion and contraction mechanism of the pair of upper conveyors 20 and 20. ing.
The above is the outline of the floor lift 10.

  The lifting mechanism of the floor lift 10 will be described with reference to FIGS. 5A and 5B and FIGS. 6A and 6B. Although only one side of the floor lift 10 will be described for the purpose of detailed explanation, the same structure as that of the left and right is adopted.

5A and 5B are perspective views of one side of the floor lift 10 as viewed from the conveyor side (front side).
5A shows a position (reduction position) in which the upper conveyor 20 is separated from the upper frame portion 21 and FIG. 5B shows a position (enlarged position) in which the upper conveyor 20 approaches the upper frame portion 21.

A motor 26 provided at the top of the fixed frame 11 raises and lowers the upper frame portion 21 using a chain 27.
Guides 12 for raising and lowering are provided on both side surfaces of the fixed frame 11, and the upper frame 21 and the lower frame 31 move up and down along the guides 12.
Here, the upper stage frame portion 21 and the lower stage frame portion 31 are connected so as to be close to and separated from each other.

6A and 6B are perspective views in which one side of the floor lift 10 is viewed from the back side, and an enlarged view of a connecting portion between the upper frame 21 and the lower frame 31 is shown.
The side portion 22 of the upper frame portion 21 and the side portion 32 of the lower frame portion 31 move up and down along the guide 12.
The side portions 22 of the upper frame portion 21 and the side portions 32 of the lower frame portion 31 are connected by the connecting rods 37 on the both side surfaces. The connecting rod 37 has a head 38 at its upper end.

That is, the rib 23 on the side portion 22 of the upper frame portion 21 and the rib 33 on the side portion 32 of the lower frame portion 31 are connected by the connecting rod 37.
The rib 23 is provided with a connecting hole 24 through which a connecting rod 37 is inserted.
In the rib 33, one end of the connecting rod 37 is fixed and attached.

In FIG. 6A, the upper frame portion 21 and the lower frame portion 31 are lowered to the lowermost position, and the upper frame portion 21 and the lower frame portion 31 are in close contact with each other.
Here, the rib 23 of the upper frame portion 21 is located away from the head portion 38 of the connecting rod 37 and descended downward.

From the state of FIG. 6A, when the upper frame portion 21 is raised by driving the electric motor 26, the rib 23 is lifted along the connecting rod 37 inserted into the connecting hole 24.
At this time, since the lower frame portion 31 receives no force from the upper frame portion 21 at all, the lower frame portion 31 is stopped at the lowest position.

Further, when the upper frame portion 21 ascends, the rib 23 reaches the head portion 38 of the connecting rod 37, the rib 23 and the rib 33 are connected, and the upper frame portion 21 and the lower frame portion 31 are connected.
As a result, when the upper frame portion 21 further moves up, the lower frame portion 31 also moves up as the upper frame portion 21 moves up.

  Therefore, when the rib 23 contacts the head 38, the stop position of the upper conveyor 91 and the lower conveyor 92 of the vertical transfer machine 90 is adjusted by setting the distance between the rib 23 and the rib 33 to a predetermined length. The upper conveyor 20 and the lower conveyor 30 can be positioned at a predetermined height.

That is, this position is a position where the upper stage conveyor 20 and the lower stage conveyor 30 stop and carry in / out the pallet 80.
When the upper frame portion 21 is lowered by driving the electric motor 26 from this height, the lower frame portion 31 is also lowered while maintaining the above-mentioned mutual distance.

Then, when the lower frame portion 31 reaches the lowermost position, only the upper frame portion 21 descends therefrom, and the rib 23 descends along the connecting rod 37 inserted into the connecting hole 24.
Finally, the upper frame portion 21 and the lower frame portion 31 come into close contact with each other and stop, and this position becomes the lowermost position of the upper conveyor 20.

Thus, the upper stage frame 21 and the lower stage frame 31 are connected so as to be close to and separated from each other.
For this reason, the upper stage conveyor 20 can load and lift the loading pallets 81, and the lower stage conveyor 30 can load and empty the empty pallets 82.

The upper conveyor 20 can stop at a position at which the upper conveyor 91 of the vertical transfer device 90 stops, and can load and unload the loading pallet 81.
The lower conveyor 30 can stop at a position at which the lower conveyor 92 of the vertical transfer machine 90 stops, and can carry in and out the empty pallet 82.

Further, when the upper stage conveyor 20 is at the lowermost position, the flange 85 can be caught lower than the flange 85 of the pallet 80 placed on the floor surface.
Therefore, the upper stage conveyor 20 and the lower stage conveyor 30 can place the unloaded pallet 80 on the floor surface or load the pallet 80 placed on the floor surface.

In the floor lift 110 shown in FIG. 11, the upper conveyor 120 is moved up and down by the motor 126, and the lower conveyor 130 is moved up and down by the motor 136. The elevating mechanism is complicated and needs to be stored in a large box-shaped fixed frame 111.
In the floor lift 10, on the other hand, the upper frame 21 and the lower frame 31 are connected so as to be able to move up and down with a single motor 26, so that the column fixed frame 11 can be simply moved up and down. Enables an efficient lifting mechanism.

FIGS. 7A and 7B show an outline of the expansion and contraction mechanism of the upper stage conveyor 20. FIG.
It is a mechanism to expand and contract the distance between the pair of upper stage conveyors 20 and 20, but on the left and right sides, the upper stage conveyor 20 is moved close to and separated from the upper stage frame portion 21. It shows.

The upper conveyor 20 is connected to an upper frame portion 21 which is formed to move up and down the fixed frame 11 by two rotating members 50, 50. The pivoting member 50 can be two or more.
Then, the upper conveyor 20 comes close to and separates from the upper frame portion 21 by rotating the rotating member 50.

  FIG. 7A shows a state in which the upper conveyor 20 is separated from the upper frame portion 21 and the distance between the pair of upper conveyors 20, 20 is at a reduced position so that the pallet 80 can be conveyed. .

FIG. 7B shows a state in which the upper stage conveyor 20 is in proximity to the upper stage frame portion 21, and the movement width W at this time is about 100 mm.
The distance between the pair of upper stage conveyors 20, 20 is an enlarged position and is wider than the pair of flanges 85, 85 of the pallet 80. Therefore, the upper stage conveyors 20, 20 can move up and down beyond the flanges 85, 85 of the pallet 80.

The pivoting member 50 is pivotable with respect to the upper frame portion 21 and is also pivotable with respect to the upper conveyor 20.
In FIG. 7A, the pivoting member 50 is directed in the direction orthogonal to the upper stage conveyor 20.
In FIG. 7B, the rotation member 50 is rotated by 90 ° from the state of FIG. 7A and is in a direction parallel to the upper stage conveyor 20.

The specific aspect of the rotation member 50 is shown in FIG.
The pivoting member 50 includes a fixed side shaft 51 that forms a hinge on the upper frame 21 side, and a moving side shaft 52 that forms a hinge on the upper conveyor 20 side. The length of the fixed side shaft 51 is L2, and the length of the moving side shaft 52 is L3.
The fixed side shaft portion 51 and the moving side shaft portion 52 are parallel to each other, and are integrally connected by the rotating plate 53. The distance between the fixed side shaft portion 51 and the moving side shaft portion 52 is L1, that is, the distance between the centers.

The rotation of the rotation member 50 can be performed by, for example, providing the upper conveyor 20 with a point of action for receiving the driving force, and applying the driving force from the upper frame portion 21. In addition, the center of the moving side shaft portion 52 can also be used as the action point.
And various methods can be considered also about the method of adding a driving force.

In the floor lift 10, one of the pivoting members 50 has an action point for receiving the driving force. That is, the drive plate 55 is attached to the rotation plate 53, and the center of the drive hole 56 provided at the end thereof is taken as the action point P.
The straight line connecting the point of action P and the center of the fixed side shaft 51 forms an angle θ with the straight line connecting the center of the moving side shaft 52 and the center of the fixed side shaft 51.

  It is preferable that the center-to-center distance L1 between the fixed side shaft 51 and the moving side shaft 52 be as short as possible. This is because when the loading pallet 81 is placed on the upper conveyor 20, a moment load proportional to the center distance L1 is applied to the upper frame portion 21. However, the center-to-center distance L1 can not be shorter than the moving width W of the upper stage conveyor 20.

  Further, the center-to-center distance L1 is related to the angular range in which the pivoting member 50 pivots. For example, assuming that the angular range of rotation is 30 °, the center-to-center distance L1 needs to be twice as long as the movement width W. In the floor lift 10, the center-to-center distance L1 has a length equal to the movement width W by setting the angle range of rotation to 90 °. It is preferable to set it as 45 degrees or more, and, as for the angle range to rotate, 60 degrees or more are more preferable.

The length L 3 of the moving side shaft 52 is shorter than the length L 2 of the fixed side shaft 51.
When the loading pallet 81 is placed on the upper conveyor 20, a large moment load is generated on the fixed side shaft 51, but the moment load on the moving side shaft 52 is small. By lengthening the length L2 of the fixed side shaft portion 51, it is possible to reduce the tensile force or the compressive force that the upper frame portion 21 receives.

The moving side shaft portion 52 is located on the lower side of the fixed side shaft portion 51, that is, near the lower end of the fixed side shaft portion 51.
When the moving side shaft portion 52 is positioned closer to the lower end of the fixed side shaft portion 51, the upper stage conveyor 20 can approach the floor surface at the lowermost position, and it is easy to catch the flange 85 of the pallet 80 Become. Then, the height from the bottom of the pallet 80 to the flange 85 can be reduced.
In addition, although the fixed side axial part 51 and the movement side axial part 52 are shown by the cylindrical member (axial cylinder) in FIG. 8, this can also be made into a rod-shaped member (axial rod).

The movement of the pivoting member 50 will be described with reference to FIGS. Both are a schematic plan view and a schematic elevation view shown in two views by the third trigonometry.
FIG. 9 shows the upper conveyor 20 separated from the upper frame 21, and FIG.

The fixed side shaft portion 51 of the rotation member 50 is held by the holding portions 65 and 65 of the upper frame portion 21 at the upper and lower sides to form a hinge. That is, the holding portions 65 hold the rotating shaft inserted into the fixed side shaft portion 51 which is a cylindrical member.
Similarly, the moving side shaft portion 52 forms a hinge together with the holding portions 66, 66 of the upper stage conveyor 20.

  The upper frame portion 21 is provided with a motor 60 for driving the pivoting member 50. That is, the rotational force of the electric motor 60 drives the drive plate 55 of the rotation member 50 via the link 61 and the link 62. The link 61 and the link 62 are pivotably connected to each other, and the link 62 and the drive plate 55 are pivotably connected to each other.

FIG. 9 shows a state in which the upper conveyor 20 is separated from the upper frame 21.
A straight line connecting the center of the fixed side shaft portion 51 and the center of the moving side shaft portion 52 in the rotation member 50 is in a direction orthogonal to the upper stage conveyor 20.
When the link 61 is rotated in the direction of the arrow by the motor 60, a driving force is applied to the action point P by the link 62, and the action point P is rotated in the direction of the arrow about the fixed side shaft portion 51.

  The pivoting member 50 is pivoted by 90 ° around the fixed side shaft portion 51 by the pivoting shown in FIG. 9, and thereby, the state shown in FIG. 10 is obtained. That is, the upper conveyor 20 is in a state in which the upper conveyor 20 is in proximity to the upper frame 21. A straight line connecting the center of the fixed side shaft portion 51 and the center of the moving side shaft portion 52 is parallel to the upper stage conveyor 20.

  In FIG. 10, when link 61 is rotated in the direction of the arrow by motor 60, driving force is applied to action point P by link 62, and the action point P is rotated in the direction of the arrow around fixed side shaft portion 51. Do. This makes it possible to return to the state of FIG.

  The driving force applied to the action point P is as easy as possible to be a linear force and is preferable. That is, it is preferable that the direction of the driving force be a straight line as close as possible to the straight line connecting the position of the action point P at the close position and the position of the action point P at the separated position.

In the floor lift 10, the driving direction is determined from the positional relationship between the upper conveyor 20 and the upper frame portion 21 and the mounting position of the rotating member 50 and the electric motor 60.
That is, the angle θ between the straight line connecting the point of action P and the center of the fixed side shaft 51 and the straight line connecting the center of the moving side shaft 52 and the center of the fixed side shaft 51 is shown in FIG. So, it's about 45 degrees.

  In the floor lift 110 of FIG. 11, as the expansion and contraction mechanism, means for rotating the upper conveyor 120 in the direction orthogonal to the traveling direction is adopted. Since the upper stage conveyor 120 is rotated with respect to the fixed frame 111 using a long arm, a large and complicated structure is required, and a large box-shaped fixed frame 111 is required.

  In the floor lift 10, the rotating member 50 and the holding portions 65 and 66 used to connect the upper conveyor 20 and the upper frame portion 21 are small parts, and the links 61 and 62 used for rotating are also small parts. Can be a simple structure. Therefore, the expansion / contraction mechanism can be simply and compactly formed on the small upper-stage frame 21 which raises and lowers the columnar fixed frame 11.

The function of the floor lift 10 will be described.
On the floor F1 on the shipping side, when the transport unit 93 starts loading the loading pallet 81, the empty pallet 82 carried out is loaded on the lower conveyor 30 of the floor lift 10.

Here, the upper conveyor 20 at the reduction position is set to the enlarged position, and the upper conveyor 20 and the lower conveyor 30 are lowered.
Then, the empty pallet 82 eventually reaches the floor surface, the lower conveyor 30 reaches the lowermost, and the upper conveyor 20 passes the flange 85 of the empty pallet 82 to reach the lowermost.

Here, the empty pallet 82 placed on the floor is loaded with a load to be a loading pallet 81. Further, the upper stage conveyor 20 at the enlargement position is set to the reduction position.
Then, when the upper stage conveyor 20 and the lower stage conveyor 30 are raised, the upper stage conveyor 20 can catch and lift the loading pallet 81, and can raise the upper stage conveyor 20 and the lower stage conveyor 30 to a fixed position where loading and unloading are possible. . After this, on the floor F1, the arrival of the transport section 93 carrying the empty pallet 82 is awaited.

  In the floor F2 on the receiving side, when the transport unit 93 starts loading the empty pallet 82, the unloaded pallets 81 are loaded on the upper conveyor 20 of the floor lift 10.

Here, the upper conveyor 20 and the lower conveyor 30 are lowered.
Then, the lower conveyor 30 eventually reaches the lowest position, the loading pallet 81 reaches the floor, and the upper conveyor 20 reaches the lowest position. Here, the upper stage conveyor 20 at the reduction position is set to the enlargement position.

The load is unloaded from the loading pallet 81 placed on the floor and is made an empty pallet 82.
Then, when the upper stage conveyor 20 and the lower stage conveyor 30 are raised, the upper stage conveyor 20 passes through the flange 85 of the empty pallet 82 and ascends, the lower stage conveyor 30 catches the empty pallet 82 and ascends, and the upper conveyor 20 and the lower conveyor 30 can be raised to a fixed position where loading and unloading are possible.
After this, the upper stage conveyor 20 at the enlargement position is brought to the reduction position, and the arrival of the transport section 93 carrying the loading pallet 81 is awaited.

The effects of the present invention will be described.
The present invention is characterized in that, in the floor lift 10, a plurality of pivoting members 50 are used as means for expanding and contracting the distance between the pair of upper stage conveyors 20, 20. The pivoting member 50 is pivotable with respect to the upper frame portion 21 and is also pivotable with respect to the upper conveyor 20.

The pivoting member 50 is a small component, and the upper frame portion 21 can be made smaller in order to connect the upper stage conveyor 20 and the upper frame portion 21 in a compact manner.
Therefore, the fixed frame 11 and the upper frame 21 can be made compact, and the turning means can be made compact.

  The pivoting member 50 can be configured to include the fixed side shaft portion 51 and the moving side shaft portion 52, and the distance L1 between the centers of the two shaft portions is reduced to the movement width W of the upper stage conveyor 20. be able to. At the same time, based on such a simple structure, the following functions can be provided.

The fixed side shaft portion 51 can be longer than the moving side shaft portion 52, and thereby can receive the moment load received by the upper frame portion 21 with a small force.
In addition, the moving side shaft portion 52 can be positioned on the lower side of the fixed side shaft portion 51, whereby the lowermost portion of the upper frame portion 21 can be lowered.

The pivoting member 50 can be provided with an action point P for receiving a driving force, and its position can be separated from a straight line connecting the centers of the fixed side shaft 51 and the moving side shaft 52.
For this reason, it becomes easy to drive the rotation member 50 from the upper stage frame 21, and the upper stage frame 21 can be made compact. And, it is possible to extend the angle range in which the pivoting member 50 pivots to 90 °.

  Furthermore, since the upper frame 21 and the lower frame 31 are miniaturized, the upper conveyor 20 and the lower conveyor 30 can be moved up and down by one electric motor 26.

  Although the present invention has been described in detail as a technology which is a significant improvement on the floor lift 110 shown in FIG. 11, for example, the floor lift 210 shown in FIG. Thus, the scaling mechanism of the present invention can be applied. Here, the lifting mechanism using the support claws 241 can also be used as it is.

That is, the upper stage frame portion 221 can be fixed, and the upper stage conveyor 220 and the upper stage frame portion 221 can be connected by the pivoting member 50 to form a scaling mechanism.
In addition, the lower frame portion 231 can be fixed, and the lower conveyor 230 and the lower frame portion 231 can be connected by the pivot member 50 to form an expansion and contraction mechanism.

Although the embodiment of the present invention has been described in detail with reference to the drawings, the specific configuration is not limited to this embodiment, and design changes to the extent not departing from the scope of the present invention are the present invention. include.
For example, the fixed side shaft portion 51 and the moving side shaft portion 52 shown by the cylindrical members can be rod-like members. Moreover, although the electric motor 60 was used in order to drive the rotation member 50, an air cylinder and an electric cylinder can be used.

10 floor lift 11 fixed frame 20 upper stage conveyor 21 upper stage frame section 30 lower stage conveyor 31 lower stage frame section 50 rotating member 51 fixed side shaft section 52 moving side shaft section 53 rotating plate 80 pallet 81 loading pallet 82 empty pallet 85 flange 90 vertical carrier

Claims (7)

A pair of left and right upper conveyors for carrying in and out the loading pallets with respect to a vertical transfer machine for transporting loading pallets loaded with pallets having a pair of left and right flanges and returning empty pallets, and the empty pallets A floor lift having a pair of left and right lower conveyors for carrying in and out of, and a distance between the pair of upper conveyors being able to be expanded and contracted,
In each of the left and right sides, the upper stage conveyor is connected to the upper stage frame portion of the fixed frame by a plurality of rotating members,
Each of the rotating members is rotatable with respect to the upper frame portion, and is rotatable with respect to the upper conveyor,
A floor lift characterized in that the upper stage conveyor is brought close to and separated from the upper stage frame portion by the rotation of each of the rotation members.   The rotating member includes a fixed side shaft forming a hinge on the upper frame portion side and a moving side shaft forming a hinge on the upper conveyor side, and the fixed side shaft and the moving side shaft The floor lift according to claim 1, characterized in that they are connected in parallel by means of a pivot plate.   The floor lift according to claim 2, wherein the moving side shaft portion has a length shorter than that of the fixed side shaft portion and is located on the lower side of the fixed side shaft portion.   On each of the left and right sides, one of the rotating members has an action point for receiving the driving force, and a straight line connecting the action point and the center of the fixed side shaft, the center of the moving side shaft and the fixed side The floor lift according to claim 2 or 3, wherein an angle formed by a straight line connecting with the center of the shaft portion is 30 ° or more.   The floor lift according to any one of claims 1 to 4, wherein on each of the left and right sides, an angular range in which the respective pivoting members pivot is 60 ° or more.   The lower conveyor according to any one of claims 1 to 5, wherein the lower conveyor is attached to the lower frame of the fixed frame on the left and right sides, and the upper frame and the lower frame are movable up and down. The floor lift described in 1 above. The floor lift according to claim 6, wherein the upper frame portion and the lower frame portion are connected to be able to approach and be separated from each other on the left and right sides, respectively.